The merman kept looking around at the levers and buttons around, eventually pressing one that seemed to be labeled with an image of a moving box of some sort. Hearing the sound of whirring somewhere outside the room, but still fairly close, he decided that he would go see what it had done. He could go report back to the others after, but maybe it had been something useful. 

As he left the room, he made sure that his camouflage was still working before he stepped out into the hall. No sense in being caught by any beasties that might be lurking around, after all.